getAvailableBundles example

$configs = $container->getExtensionConfig($extensionAlias);
        $configuration = $extension instanceof ConfigurationInterface ? $extension : $extension->getConfiguration($configs, $container);
        $this->validateConfiguration($extension, $configuration);

        return (new Processor())->processConfiguration($configuration, $configs);
    }

    public function complete(CompletionInput $input, CompletionSuggestions $suggestions): void
    {
        if ($input->mustSuggestArgumentValuesFor('name')) {
            $suggestions->suggestValues($this->getAvailableExtensions());
            $suggestions->suggestValues($this->getAvailableBundles());

            return;
        }

        if ($input->mustSuggestArgumentValuesFor('path') && null !== $name = $input->getArgument('name')) {
            try {
                $config = $this->getConfig($this->findExtension($name), $this->compileContainer());
                $paths = array_keys(self::buildPathsCompletion($config));
                $suggestions->suggestValues($paths);
            } catch (LogicException) {
            }
        }

        $io->writeln(null === $path ? $dumper->dump($configuration, $extension->getNamespace()) : $dumper->dumpAtPath($configuration, $path));

        return 0;
    }

    public function complete(CompletionInput $input, CompletionSuggestions $suggestions): void
    {
        if ($input->mustSuggestArgumentValuesFor('name')) {
            $suggestions->suggestValues($this->getAvailableExtensions());
            $suggestions->suggestValues($this->getAvailableBundles());
        }

        if ($input->mustSuggestOptionValuesFor('format')) {
            $suggestions->suggestValues($this->getAvailableFormatOptions());
        }
    }

    private function getAvailableExtensions(): array
    {
        $kernel = $this->getApplication()->getKernel();